Inventories (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Inventories [Line Items]
Long-term contracts in progress	$ 1,187	$ 2,129
Commercial spare parts, used aircraft, general stock materials and other	9,419	7,685
Airplane Program 737 [Member]
Inventories [Line Items]
Deferred production costs	1,313	463
Unamortized tooling and other non-recurring costs	521	471
Deferred production, unamortized tooling and other nonrecurring costs to be recovered from firm orders at the balance sheet date	1,829
Deferred production, unamortized tooling and other nonrecurring costs to be recovered from future orders	5
Airplane Program 777x
Inventories [Line Items]
Inventory, work in process	5,628	3,067
Unamortized tooling and other non-recurring costs	2,914	2,512
Airplane Program 787
Inventories [Line Items]
Inventory, work in process	24,772	27,852
Deferred production costs	18,716	22,967
Supplier advances	2,202	2,453
Unamortized tooling and other non-recurring costs	2,092	2,638
Deferred production, unamortized tooling and other nonrecurring costs to be recovered from firm orders at the balance sheet date	14,386
Deferred production, unamortized tooling and other nonrecurring costs to be recovered from future orders	6,422
ULA [Member]
Inventories [Line Items]
Long-term contracts in progress	176	227
Capitalized Precontract Costs [Member]
Inventories [Line Items]
Inventory subject to uncertainty	711	644
Early Issue Sales Consideration [Member]
Inventories [Line Items]
Inventory subject to uncertainty	$ 2,863	$ 2,844